Assertion :The free gaseous $C r$ atom has six unpaired electrons. Reason: Half-filled s-orbital has greater stability.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
The free gaseous $C r$ atom has six unpaired electrons due to following electronic configuration (atomic number = $24$ ) = $[A r] 3 d^{5} 4 s^{1}$ .

This is because half-filled d-orbital is more stable as compared to incompletely filled d-orbital.

So, one electron jumps from $4 s^{2} -$ orbital to $3 d -$ orbital.

Hence, option $C$ is correct.

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